If you know you've chosen 'C' say, can you then go onto read parameters L,a,b ?

In short, you need to put forth some actual effort.
Colouring in your prose and dumping your assignment doesn't count.

Make an honest attempt, post your code where you get stuck, and ask a specific question.
Eg
"I can read all the parameters for C type capacitor, but why does it always prints zero?".
That is a specific question based on some coding effort.

If you know you've chosen 'C' say, can you then go onto read parameters L,a,b ?

In short, you need to put forth some actual effort.
Colouring in your prose and dumping your assignment doesn't count.

Make an honest attempt, post your code where you get stuck, and ask a specific question.
Eg
"I can read all the parameters for C type capacitor, but why does it always prints zero?".
That is a specific question based on some coding effort.

this homework is much higher than my level
i dont use to make an main menu and make it work in a such program this why i ask for help to see if i can read it and understand it or no

Have you looked at your previous program to see how it handles basic things like
- using scanf to read input from the user
- using 'if' statements to decide a course of action.

Homework is there to enable the tutor to find out whether you've learnt anything.

It seems to me that if you've been coasting along getting others to do your work for you, and in doing so, you've failed to fully understand what you're supposed to do when faced with a new programming challenge.

Perhaps you should just drop the course if you're not willing to put in any effort on your own.

I mean, if you can't even manage to print a few strings and prompt for a choice (something you should have mastered weeks ago), then there really is no hope for you.

So you've been sitting on your hands for 2 weeks now, and now it's "urgent".
Or have you been wandering from one forum to another hoping to find some mug to do your homework, but come up empty?

Cheating is taken seriously. Any cheating attempt will result in 0 for this homework and the remaining ones.
EACH STUDENT IS REQUIRED TO DO THE HOMEWORK ALONE. COPYING FROM ANY SOURCE IS REGARDED AS CHEATING.

i just finished my exams so i can deal with that by my own but i notice that there are a new things in this homework i dont remember that i took them
this why i ask for help (i cant even start ) because i think this will take days from me to understand what i can do with this task and organize it
but if you dont want to help me or you think why i am doing it because the dead line is come up its ok its not even "urgent" i am sure i can come up with the solution alone
but i need days and i have exams too
and yes this is my course ics 103 in kfupm

You should also review all your equations since the answers are wrong. The biggest thing that I can see is you're not necessarily dividing right: you need to use ( grouping ) to divide by the right quantities.